Rin was sitting at the corner of the library, studying something from a big book, he's learning about making potions from an old book. He looks frustrated.

"Fail, fail, fail again. Damn." He muttered and scribbling in his notebook.

He is one of the students from house Slytherin at Hogwarts who's very ambitious. He is also a genius, approved by the teacher of Potions subject, Ego.